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<br />The period of study was divided into the 'historic' administration period and the 'current' <br />administrative period. Water years 1945 through 1984 represented historic conditions and years <br />1985 through 1990 represented current conditions. Within the entire study period (1945 - 1990), <br />water years in which a call was initiated by the Cameo demand were identified. These are years <br />that can be compared to assess changes in operation of the Check under historic and current <br />administration. Unfortunately, records of water right calls are not documented prior to 1977. <br />Therefore, priorto 1977, dry years were selected 10 represent years in which an administrative call <br />from the Cameo demand was probable. The water years selected to represent river operations <br />under historic water right administration include; 1953, 1954, 1955, 1956, 1958, 1960, 1963, <br />1966, 1977, 1978 and 1981. Water years selected to represent river operations under current <br />administration includes 1987 through 19902. <br /> <br />1 <br />. <br />;. <br /> <br />Table 1 provides a summary of the modelled Check operations under historic and current <br />administration.. Historically, the frequency, duration and volume of water checked were all <br />substantially greater than under current practices. Prior to 1985, the Check was in place an <br />average of two and one-half months and averaged 288 cfs. Annual maximum values averaged <br />502 cfs and peaked at 582 cfs. During these years, the average flow of water at the Cameo gage <br />during periods that the Check was in operation was 1,708 cfs. <br /> <br />Under current administrative practices, the Check is implemented less frequently and averages 135 <br />cfs. This is less than one-half of the historic average daily flow in the Check. More significant is <br />the observation that under historic conditions, an average of 45,105 AF of water flowed through <br />the Check annually when the Cameo call was on the river. Presently, only 17,921 AF of water <br />flows through the Check during periods of a call. The. difference, about 27,200 AF, represents <br />water that must now originate primarily from Green Mountain releases. The average streamflow <br />of the Colorado River at Cameo during periods when the Check is in place is currently 1949 cfs. <br /> <br />The data suggests that the change in administration by the Division Engineer has substantially <br />changed the operation of the. Check during dry years. As reflected in column 5 of Table 1, the <br />change has increased the demand of water at Cameo necessary to satisfy the demand of the water <br />rights. Prior to 1985, the Cameo demand could be met with flows of approximately 1,700 cfs. <br /> <br />2 <br /> <br />No water right calls were made by the Cameo rights during the period 1982 through <br />1986. <br /> <br />9 <br />